Improvement in piston balance-valves for steam-engines



S. MALTBY.

Piston Balance-Valves for steam-Engin'ess. N0.l48,075, I Patent ed March3.187-4.

Wifmasscs. Invert-tor. /L W i UNITED STATES PATENT OFFIoE.

SIDNEY MALTBY, OF CLEVELAND, OHIOL IMPROVEMENT IN PISTON BALANCE-VALVES FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 148,075, dated March 3, 1874; application filed February 2, i874.

To all whom it may concern:

Be it known that I, SIDNEY MALTBY, of

Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain Improvements in Piston Balance-Valves, of which the following is a spcification:

This invention relates to certain improvements in that class of steam-valves known as pistonvali'es; and the invention consists of a tapering sleeve or bush arranged within the valve-case, having an external annular depression, an opening over the exhaust-port, and diagonal port-openings, as hereinafter more fully specified and claimed. I To enable my invention to be fully understood, I will proceed to describe the same in edetail with reference to the accompanying drawing.

Figure l is a vertical longitudinal section of a valve and steam-chest containing my im provement. Fig. 2 is a detached view of the before-mentioned sleeve which embodies my improvement.

' Arepresents the case of the valve, the inside surface being provided with annular chambers forinin g the steam-ports leading to the cylinder. B is a sleeve whose outside surface is straight from one end to the other, but is made slightly tapering from end to end, so that one end is a little smaller in diameter than the other. By this meansit is easily made rectly over the exhaust-port.

to fit inside the case A. There is also a slight annular depression in the outer surface of the said sleeve B, in width corresponding to the exhaust-chamber in the case A. A portion of the under side of the sleeve B is cut away di- Through the sleeve B are also made diagonal openings 1) I), connected with the annular lead-ports in the case A. G is a piston-valve fitted to play inside of the sleeve B. This valve and case may set inside of a steam-chest, in which case the case A need not have heads attached, .but should the valve and case be used or placed on a cylinder alone, then the-ends of the case A must be closed with closely-fitting heads. Making the openings 1) diagonal makes the valve-wear alike on its whole surface.

I am aware that it is not new to provide valve-cases with interior bushings, and I do not desire to claim this.

But what I do claim is- The tapering sleeve or bush 13, having an external annular depression and an opening over the exhaust-port, and provided with diagonal openings 1), substantially as and for the purpose described.

SIDNEY MALTBY.

Witnesses:

GEO. W. TIBBITTS, CHARLES A. STrnLn 

